Ore-grinding machine



G. w. MORTHLAND.

oRE'GmNmNG MAcHmE.

APPLICATION FILED DEC. 20. |918. f Patented Dec. 28, 1920.

2 SHEETS-SHED l.

@Hof/neg UNITED `STATE/sf PATENT. oFF-ice.)

' GEORGE w. non'rHLAi'qD, or LEAD, SOUTH nuora.

03E-calname mcnnm 1,363,990. Speciqat'in 0f Letters Patent- PatentedDec. 28, 1920.

Application led December 20, 1918. Serial No. 267,686

To aZZfwwm it may concern: '.trated inthe accompanying drawings, in

Be it known that I, GEORGE W. Mo'iirrrwhich: j LAND, a citizen of theUnited States, residing Figure l'is a longitudinal sectional view atLead, in the county of Lawrence and through my' device complete, l Stateof Sout Dakota, have invented new Fig. 2 is a cross sectional view vthrough 60 and useful Improvements in Ore-Grinding `the saine showingone form of disks,` Machines, of which the following is aspeci- Fig. 3is an elevation illustrating. amodi- 'cation. f fied form of disks, lThis invention relates to crushing and Fig. 4 is a cross sectional viewon theline `1o grinding machines, particularly to that type 4 4 of Fig.3, 65 employed for crushing and grinding ores, Fig. 5 -is an elevationillustratinga still and has for its object the provision of a furthermodified form of disks, and grinding. machine of the tube mill type Fig.' 6-is a cross 'sectional view therewhich includes a rotatingtapered'casing through on the line 6-6 of'Fi 5. Y within which isdisposed co-acting disks of Referring more particularly to the .draw- 70vdifferent diameters and provided upon their ings the numeral l0designates the head at confronting faces with recesses engaging theinlet end of the device, this head-having.

and crushing the material vfed axially I extendingI from its center atrunnion 11 pro.

through the device, all Aof the disks rotating vvided with a centralopening 12 forming an at different .speeds whereby they willI moveinletopening. olted upon the other side 7`5 relatively to one anotherwhereby to obtain of the head 10 is a ange member '134 to the maximumgrinding effect upon the ma which is secured the lar e`r` end of atapered terial, the disks furthermore rollingupon casing 14 .which isclosed atits other. end by the material disposed between their periphyahead 15 having extending from the center eries and the inner peripheryofthe tapered thereof a trunnion 16 provided Ywith an 8 0 casing.opening 17 constituting the discharge opena tube'mill of this characterin which the ed upon thel head f1.5 and'upon the tadisks pro ress iveldecrease in thickness pered casing 14 for holding these partssef 3owhereby t e num r of griny surfaces curelyv assembled. The trunnions 11land 16'85" will be increased toward the disciarge end are mounted insuitable bearin 19' so that of the device whereby coarse material fedthe entire device may be rotatev. into' the device may in one operationbe re- .Disposed against the inner periphery of duced-'to extremeneness. the tapered shell or casing 14 is a lining 20',

vAnother object isthe provision of a device preferably of wood, whichis. in turn en '90;

An important object is the provision of of the device. Av flangemember'18 is f ofthis -character-which may bev used with gaged by ametallic lining'21 fo l the either a current of air ora current of wateri inner shell. Bolted" upon' the heads 1 and as the means forprogressing the material 15 are hardened Steel lplates'22* andjf: 'l

through the. device from the inlet to the .23 respectivelywhich have'their periph- 40 outlet end thereof. Y

Still another object is the provision of a inner meta ic shel1 21. 'I hepurpose of thel` 'device of this character in which the rowooden liningisto serve asa shockl tating disks are formed of sections, the outerabsorber for tali1n' `up;a great `deal 'of v the section being removableand replaceable in shock incident to t use ofthe device. caseof wear.r s

Another object isthe revision of'a de- 14 and bolted tothe ange'member13 v vice of this character w ch' will be comand head 10 is a ring. ear244 which may be A eries'engaglmgl the lnner periphery of the '95securea'uponthe larger end of 'checas-ion parativel Vsimleand-inexpensivein manu* enga ed b 'anysuita le drivenpinionforf. '4 -vfacture, highly? eilcientv in use, durable Ain rotating tli'e casing. It'notedthat so service, ecient in operati im rovem'ent inthe art."- to,.is -formed of. longitudinally extending ith theabove 'and otherrobjectsand adsections which' are 'prevented from -dislrza-A vantagesjin view,the invention consists in tionf by the means ofthe lining plates 22 the.details of construction to be hereinafterand 23 at the end of. theouter casing..

e more and claimed, and Disposed' withi n the interior of the linne;-119 on and. a. general the inner metallic casing 21, above referred'1015;4

casing 21 is a lurality of disks 25, the alternate ones o which are ofdifferent diameters as clearly shown in Fig. 1. In the form of' disksshown in Figs. 1 and 2 each disk is shown as comprisili a rin -likemember having its outer perlphery p aned for rolling action in relationto the inner shell 21. Furthermore, each disk 25 has its faces providedrwith radiall extending grooves-26 which are V-shape in cross section,as shown. It will be noted that the disks 25 at the larger end ofthecasing are of appreciably greater thickness than the disks at thesmaller end of the casing and that the disks progressively decrease inthickness toward the discharge end of the device.

The operation of the device is as follows:

The casing is rotated in any desired man-y ner and the material to becrushedl and ground is introduced throu h the opening 12 in the trunnion11 and w1ll pass into the openings in the centers of the grinding disks.vIn view of the fact that the disks are of different diameters. thesedisks will be rotated at diierent speeds and will consequently rotateinl respect to one another. The material falling into the openiligswithin the disks willpass into `the -shaped grooves 26 and will becrushedI therein by *y the relative rotation ofthe successive disks. Aportion of the material will pass through the radial grooves 26 to theouter periphery of the disks and will always be dlsposed at the lowerportion of the casing, the disks rolling u on this material and crushingit continual y. If any of the material adheres to the inner lining 21,vas the casing is rotated and this adhering material approaches the topof the casing it will fall by gravity back onto the disks and be crushedfurther. In view ofthe fact that the casing is taperedhthere will be atendency to cause the disks to gravitate toward the larger end of/ thecasing, thereby keeping the crushing disks in close contact `with oneanother. The friction generated between the relatively rotating diskswill prevent excessive shock against the sides of the casing. Owing tothe taper of the casing all of the disks, re-

. gardless of diameter, will travel a variable number `of rim feet perminute, the smaller disks of course turning a greater number ofrevolutions than the larger ones, thereby causing a continuous eccentricgrinding motion between the planes of the -disks as they roll forward inthe line of travel. It will be noted that in view of the fact that thedisks toward the discharge end of the 'device are of less thicknessthanthe disks toward the inlet ,end of the device that a greater numberof grinding planes will be provided toward the discharge end and .thatthev material will be consequentlyvground conducting the materiall into,through and with registering radially extending grooves disks whilepermitting passage of material ent1rely` through the disks. In slimingthe forms of disks shown in Figs. 1v and2.

more 'and more as the material is reduced to 65 smaller pieces.

It 'is understood, of course, that. in the use of the 4device either acurrent of air or" a stream of water must be employed for out of thedevice. After the device is in operation for some time and the materialis reduced to the proper fine-ness, the out'- flowing stream either ofair orv water will pass from the opening 17 inthe trunnion 16, carryingwith it the finer particles of material.- ny particles of material tooheavy to be carried out by the stream of air or water will be' caughtwithin the recess 27 at the .dischar e end of the device and returnedthroug the centers of the disks for further grinding. l 4

'In Figs. 3' and 4 I have shown a modified form of grinding disk. Inthis form, the disk is shown as comprising an outer section 28 providedupon its inner periphery with a continuous tongue 29 engaging withincorresponding grooves formed. 1n the outer periphery of an inner ringformed of arcuate sections, 31, held together at their lmeeting ends bypreferably hard wood Wedges 32 seating within corresponding re'- cesses33 in the ends of the sections. In this form of disk when the outersection becomes 'Worn after long use, it may be removed and replaced byva new section, the sections of the inner rin being interchangeable andbeing suitable .or continuous use. In this form of disk the'inner, ringsections are provided 34 of the same configuration and arran ement asthe grooves in the previously escribed form of disk., The operation ofthe device, when equipped with this form of disk is identically the sameas the operation when the previously described form is employed.-

Referring to Figs. 5 and 6 it will be seen that I -have provided a stillfurther modiled form of disk. In this form, each disk 35 is providedwith a relatively small central opening 36 and is further provided witha plurality of concentrically arranged series of perforations 37 and 38,the` outer series 38 having communicating therewith radially extendinggrooves 39 which extend to the -outer -periphery of the. disks and`which are V-shaped in cross section. This form' of disk is particularlyadapted for use in sliming; that is, when it is desired to grind thematerial to an extremely fine degree.

` It will be noted that in this form of disk Athe series ofperforations- 38 and 37 are countersunk so as to be the equivalent ofthe V-shaped grooves in the other forms of and 3 and 4 are removed fromthe casing and an entire set of the disks shown in Fi 5 and 6substituted in place thereof. T e operation is the same regardless ofwhich form of disk is used.

From the foregoing description and a study of the drawings it will beapparent that I have thus provided an ore crushing and grinding machinein which all the disk members not only exert a crushing .and poundingaction at their peripheries on the material introduced into the device,but also rotate relatively to one another, owing to the taper of thecasing, whereby the material will be constantly subjected to a grindingaction between all the successive disks.

While I have shown and described the preferred embodiment of theinvention, it will of course be readily understood that I reserve theright .to make such changes in the form, construction and arrangement ofparts as will not depart from the spirit of the in-v vention or thescope of the appended claims.

Having thus described my invention, what I claim is:

1. A device of the character* described comprising a rotary casing, anda plurality of disks' of progressively decreasing thickness toward thedischarge end and of diferent diameters disposed within said casing,said disks being adapted to rotate relativel/ to one another when saidcasing is rotated, each ofI said disks being'provided with a centralopening forming a continuous pasA sageway through said disks and havingtheir confronting faces provided with radially extending groovesextending from the central openin to the outer periphery.

2. In a evice of the character described comprising a rotary casing, aplurality of grinding disks each formed of a continuous outer sectionand an inner section formed of segments and having tongue and grooveconnection with the outer section, and wedge members engaged between theends of the segments whereby to hol'd the inner section expanded, saidsections being provided with registering radial grooves. n testimonywhereof I aix m signature. GEORGE W. MORTIILAND.

